linux-kernel - Benchmarks of kernel tracing options 2 (ftrace, lttng and perf)

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Date:	Wed, 17 Nov 2010 16:31:38 -0500
From:	Douglas Santos <douglas.santos@...ymtl.ca>
To:	linux-kernel@...r.kernel.org
Cc:	ltt-dev@...ts.casi.polymtl.ca, David Sharp <dhsharp@...gle.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michael Rubin <mrubin@...gle.com>
Subject: Benchmarks of kernel tracing options 2 (ftrace, lttng and perf)

Hi all,

This is a response to a benchmark, submitted a few weeks ago, comparing kernel
tracing options.
http://lkml.org/lkml/2010/10/28/422

We followed the methodology described in the link bellow,
but using the shellscripts posted there to reproduce autotest scripts.
http://lkml.org/lkml/2010/10/28/261

We disabled the extra syscall tracing on lttng, for a fair comparison.
http://lkml.org/lkml/2010/10/28/290

Average results with tracing "on":

lttng:  220 ns
ftrace: 260 ns
perf:   740 ns

E5405 system
kernel 2.6.36

-lttng 0.239 + 0.19.2modules + sys_getuid tracepoint + sys_getuid probe
 + remove syscall_trace

-ftrace and perf + sys_getuid tracepoint

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